There were 5 or 6 plugin updates for Jenkins v.1.476 which I have running on a Linux VM. The UI showed progress while updating as usual and I typically have to refresh the screen to see Jenkins reboot. However, this time it never restarted and was unresponsive. After refreshing a few times, it did show an error

Clearly there's an issue with the maven plugin. Do you actively use maven? Even if you do, you could try removing it at the very least to get the app up and running.
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corsiKa♦Nov 20 '12 at 20:43

The Maven plugin is integrated into Jenkins/Hudson and is delivered as part of the core. Can you give more of the stack trace, and possibly the versions of plugins that are installed?
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Toby JacksonNov 20 '12 at 22:23

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Updating Jenkins to the latest version (1.491) appears to have resolved the issue. At least there is no longer a plugin update for maven and all other updates are working. Thank you for the feedback.
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RussellNov 20 '12 at 22:28

1 Answer
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It appears you can get around the issue (at least enough to get back into the GUI to revert the change) by deleting the $JENKINS_HOME/plugins/maven-plugin.jpi.pinned file. Standard rules about backing things up still apply.